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Discussion Starter #1
I was just doing some dyno testing on a 545 build that I did for a customer who plans to use the engine in a four wheel drive truck for trail riding and some playing in the mud.

The build consists of: A D1VE block bored .030 to 4.390 bore size, Mahle dished pistons and rings, Scat I beam 6.700 length rods, Scat forged 4.500 stroke crank, Power bond damper, stock Melling oil pump and drive shaft in a Millodon 4X4 oil pan. The heads are ported DOVE-C's with SI CJ size stainless valves, double springs, chrome moly retainers and a set of Yella Terra pedestal mount roller rockers.

The cam is a hydraulic roller from Demos' Cams ground using a lobe from a series of hydraulic roller lobes that I had designed for use in Ford Cleveland, Big Chevy, Big Ford or any engine with a big base circle, heavy valvetrain and high ratio rockers. I used the DM230HR lobe on both the intake and exhaust on a 108 lobe separation in on a 108 intake centerline.

The intake manifold is an Edelbrock Torker 2 that has been ported in the plenum and port matched to the heads. Carburetor is my 950HP and overall the best combination was that carburetor on a 4 hole on top of a 1 inch open spacer. Best total timing 33 degrees.

Exhaust is a set of headers that were home made by Wes Littrell in a T bucket style, 2 inch pipes into 3.5 inch collectors with Schoenfield mufflers.

Best torque and HP on 91 octane pump gas is 700lbs/ft at 4000rpm and 600 horsepower at 5100. My dyno simply would not pull the engine any lower so starting at say 3000rpm was not possible.
 

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Dave,

Would you share a few more details?

Comp ratio?

Lift and duration on the cam?

Why a Torker 2?
 

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Discussion Starter #4
Pistons are the Mahle BBF350390I38 with a 38cc dish, 1.5, 1.5 3mm ring package and a 1.350 compression height. This gave a compression ratio of approximately 9.75:1

The Torker 2 was used because it is a good match for a standard entrance cylinder head and after some porting work it seemed to work well.

The cam is a hydraulic roller ground by Demos' Cams Jefferson GA. The cam is ground using a DM230 lobe. This design is intended to be ground on a 1.312 base circle so it grows a little(3 degrees at .050) when ground on a 1.400 base circle as in this case. This give it a measured spec when plotted of 233 at .050 intake and exhaust ground on a 108 degree lobe separation and installed in the engine on a 108 intake centerline. Lift with a 1.73 rocker ratio is .621 intake and exhaust.

This is the first time I've used one of these lobes in a big Ford but in case you're wondering there are currently four lobes in the series, a 230, a 234, a 238 and a 242 all with the same .359 tappet lift. They have been working well in Cleveland applications.
 

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Pistons are the Mahle BBF350390I38 with a 38cc dish, 1.5, 1.5 3mm ring package and a 1.350 compression height. This gave a compression ratio of approximately 9.75:1

The Torker 2 was used because it is a good match for a standard entrance cylinder head and after some porting work it seemed to work well.

The cam is a hydraulic roller ground by Demos' Cams Jefferson GA. The cam is ground using a DM230 lobe. This design is intended to be ground on a 1.312 base circle so it grows a little(3 degrees at .050) when ground on a 1.400 base circle as in this case. This give it a measured spec when plotted of 233 at .050 intake and exhaust ground on a 108 degree lobe separation and installed in the engine on a 108 intake centerline. Lift with a 1.73 rocker ratio is .621 intake and exhaust.

This is the first time I've used one of these lobes in a big Ford but in case you're wondering there are currently four lobes in the series, a 230, a 234, a 238 and a 242 all with the same .359 tappet lift. They have been working well in Cleveland applications.
Hey Dave nice build.

What lifters and valve springs you using with the hydraulic roller?

Cheers, Bob
 

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Discussion Starter #8
Hey Dave nice build.

What lifters and valve springs you using with the hydraulic roller?

Cheers, Bob
PBM 3450 at 1.850 installed height. 145 seat 423 open rate of 448lbs/in.

Morel "street" tie bar lifters from Erson but also available from a lot of other cam companies.
 
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